| .. SPDX-License-Identifier: GPL-2.0+ |
| .. sectionauthor:: Caleb Connolly <caleb.connolly@linaro.org> |
| |
| Qualcomm debugging |
| ================== |
| |
| About this |
| ---------- |
| |
| This page describes how to enable early UART and other debugging techniques |
| for Qualcomm boards. |
| |
| Enable debug UART |
| ----------------- |
| |
| Newer boards (SDM845 and newer, those with GENI SE UART) |
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| |
| Open ``configs/qcom_defconfig`` and add the following snippet to the bottom: |
| |
| CONFIG_BAUDRATE=115200 |
| |
| # Uncomment to enable UART pre-relocation |
| CONFIG_DEBUG_UART=y |
| CONFIG_DEBUG_UART_ANNOUNCE=y |
| # This is the address of the debug-uart peripheral |
| # The value here is for SDM845, other platforms will vary |
| CONFIG_DEBUG_UART_BASE=0xa84000 |
| # Boards older than ~2018 pre-date the GENI driver and unfortunately |
| # aren't supported here |
| CONFIG_DEBUG_UART_MSM_GENI=y |
| # For sdm845 this is the UART clock rate |
| CONFIG_DEBUG_UART_CLOCK=7372800 |
| # Most newer boards have an oversampling value of 16 instead |
| # of 32, they need the clock rate to be doubled |
| #CONFIG_DEBUG_UART_CLOCK=14745600 |
| |
| Then build as normal (don't forget to ``make qcom_defconfig``` again). |
| |
| Older boards (db410c and db820c) |
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
| |
| Open ``configs/dragonboard<BOARD>_defconfig`` |
| |
| CONFIG_BAUDRATE=115200 |
| CONFIG_DEBUG_UART=y |
| CONFIG_DEBUG_UART_ANNOUNCE=y |
| # db410c - 0x78b0000 |
| # db820c - 0x75b0000 |
| CONFIG_DEBUG_UART_BASE=0x75b0000 |
| CONFIG_DEBUG_UART_MSM=y |
| CONFIG_DEBUG_UART_CLOCK=7372800 |
| #CONFIG_DEBUG_UART_SKIP_INIT=y |
| |
| CONFIG_LOG=y |
| CONFIG_HEXDUMP=y |
| CONFIG_CMD_LOG=y |
| CONFIG_LOG_MAX_LEVEL=9 |
| CONFIG_LOG_DEFAULT_LEVEL=9 |
| CONFIG_LOGLEVEL=9 |
| |
